2011 Volvo S40 Owner's Manual - Page 158

06 Starting and driving Stability system Stability Traction Control (STC)/ Dynamic Stability Traction Control (DSTC) The stability system consists of a number of functions designed help reduce wheel spin, counteract skidding, and to generally help improve directional stability. A pulsating sound will be audible when the system is actively operating and is normal. Temporarily switching off Spin control 1. Turn the thumbwheel (A) on the left-side steering wheel lever until the STC/DSTC menu is displayed. 2. Hold down the RESET button (B) to toggle between STC SPIN CONTROL OFF/STC ON or DSTC SPIN CONTROL OFF/ DSTC ON. NOTE G020349 Function/ system TC SC AYC A STC X X DSTCA X X X Thumb wheel RESET button • • * Spin control (SC) The spin control function is designed to help prevent the drive wheels from spinning while the vehicle is accelerating. Under certain circumstances, such as when driving with snow chains, or driving in deep snow or loose sand, it may be advisable to temporarily switch off this function for maximum tractive force. The message STC SPIN CONTROL OFF/DSTC SPIN CONTROL OFF indicates that the stability system's spin control function has temporarily been switched off. The spin control function is automatically enabled each time the engine is started. system functions are active. 06 • STC ON/DSTC ON indicates that all Active yaw control - AYC (DSTC only) This function helps maintain directional stability, for example when cornering, by braking one or more of the wheels if the vehicle shows a tendency to skid or slide laterally. This is one of the stability system's permanent functions and cannot be switched off. Traction control (TC) This function is designed to help reduce wheel spin by transferring power from a drive wheel that begins to lose traction to the wheel on the opposite side of the vehicle (on the same axle). TC is most active at low speeds. This is one of the stability system's permanent functions and cannot be switched off. 158